Telemeter.



` m/ K @WM No. 810,541. PATBNTBD 11110.23, 1900.

A. JOORS & A. MERCENIBR.

TELEMBTBR.

APPLICATION FILED M0110, 1005.

'UNITED sTATEs PATENT oEEioE.

ALPHONSE JOORS, OF FOREST, NEAR BRUSSELS, AND ADHMAR MEROENIER, OF BRUSSELS, BELGIUM.

TELENIETER.

Specification of Letters Patent.

Patented Jan. 23, 1906.

T0 all whom t may concern:

Be it known that we, ALPHONSE JooRs, mechanician, residing at Forest, near Brussels, 77 Avenue Albert, and ADHEMAR MER- OENIER, oicer of the Belgian army, residing at Brussels, 32 Rue Philippe-le-Bon, Kingdom of Belgium, citizens of the Kingdom of Belgium, have invented certain new and useful Improvements in New Practical Telemeters; and We do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters and iigures of reference marked thereon, which form a part of this specification.

Our invention relates to telemeters, and has for its object to construct a simple and easily-operable instrument capable of adjustment to various distances with details of construction hereinafter described and claimed.

Referring to the drawings, in which like parts are similarly designated, Figure 1 is an elevation of the telemeter. Fig. 2 is a section of the ball-and-socket joint. Fig. 3 is a plan view of the apparatus. Fig. 4 is an elevation showing the telescopic tubes partly extended, the foot being broken away. Fig. 5 is a diagram illustrating the principle of operation.

The apparatus consists of a tape-case O, having a lateral longitudinal slot l0, through which a tape or scale F can be drawn from its spring or other barrel. The tape is a fabric having a copper face and is graduated either from Zero to three thousand meters for infantry or from Zero to six thousand meters for artillery at the will of the operator. A wire loop or other piece l1 prevents the end of the tape from passing through the slot into the case. Attached to the side of the case O is a main tube J, in which are slidably, but not rotatively, mounted a number of telescoping tubes B, here shown as flve. The main tube as well as the telescoping tubes are preferably, but not necessarily, rectangular in section to prevent their rotation one within the other.

On the main tube J is a supporting member D, capable of being moved along the tube J and clamped in any desired position. This support has formed on its lower end a ball H,

forming part of ball-and-socket joint, and is or small tele surlnounted by a sight-tube E provided with the usual hair-lines, and

scope on the top of the tube are gun-sights, the rear i one, 12, being a notch and the front one, 13, a point. The sight-tube or telescope E is mounted so as to be fixed always at right angles to the main tube J.

The ball H is mounted in a suitable socket 14, (see Fig. 2,) having a perforation through which a sleeve M, threaded internally, can slide. Passing in the socket is a thumbscrew N, that screws into the sleeve and forces it against the ball to hold the latter tight in the socket. A spring 15 surrounds screw N and tends to force the sleeve M outward, so that the ball will be quickly released when the thumb-screw N is unscrewed. The lower end of the socket member is threaded to receive the end of the stationary member A of a clamp a A, the movable member a of the clamp being pivoted. A screw A is fixed at one end in the jaw A and passes through a slot or perforation in the aw a. A thumb-nut 21 on screw A will hold the jaws closed on the object to which the instrument is to be fastened.

At the end of the innermost tube B is fastened a plate L by means of the screw 20, the head of which forms a knob by which the telescopic tubes are drawn out.

On the plate D is mounted the adjustable sight-tube or telescope G, having gun-sights 12a and 13lL and in construction like the one E 5 but this tube is pivoted to move slightly toward the sight-tube E, and in order to do this the plate L is extended forward and formed into a fork 16. From the under side of the sight-tube G depends a lug 17, Fig. 3, that is moved by the thumb-screw l. On the part D is an edge 18 in line with sightpoint, and on the part L is a similar edge 19, the distance between which edges is measured by the tape F to give the distance of the obj ect sighted.

The operation is as follows: The device is iixed, bymeans of its clamp aA, to a bayonet or saber that is stuck in the ground or in a tree or to a stake or to any'other convenient object and is then set level by means of the ball-and-socket joint H 14 and moved so that the sight-tube E is directed on'the object and is clamped in position by the screw N.

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The sight-tube G is then moved to or from the one E until the object is sighted through 1t. The distance between the edges 18 and I 19 is then measured by the tape and the distance of the object directly read off. To adjust the apparatus, the two sight-tubes are placed 'a distance apart measured by the tape-say one hundred units, the actual distance apart being two centimeters. Both sight-tubes are now directed to a person or object placed one hundred meters from the instrument, the one, E, being directed on the object rst, and the other one, G, is set on the object by the set-screw I. For infantry this adjustment is made for one hundred meters and for artillery for two hundred meters, so that the apparatus will indicate distances up to three thousand meters for infantry and six thousand meters for artillery. If the adjustment is made on an object live hundred meters distant from the instrument for the given distance apart of the sight-tubes or telescopes, distances can be measured to fifteen thousand meters.

The principle of operation is based on the proportionality of like sides of similar right triangles,(see Fig. 5,) where the base B2 C2 is represented by the extensible tubular members J B of the apparatus, the side A2 B2 the distance of the object from the instrument, and the angle A2 C2 B2 being constant and the same as theiangle between the sight-tube G and the extensible base J B of the instrument. The triangles A2 B2 C2, D2 B2 E2, and F2 B2 G2 being similar right triangles, the angles at their bases being equal, their bases and sides are proportional, and wevhave Having thus described our invention, what we claim as new, and desire to secure by Lete ters Patent, is'

1. A telemeter comprising a plurality of telescoping tubes, a sight-tube mounted on the outer tube at right angles thereto, a like sight-tube mounted on the end of the innermost telescoping tube and at an angle to the Erst sight-tube and means to measure the distance between the two tubes, substantially as described.

2. ln a telemeter, a plurality of telescoping tubes, a supporting member on and adjustable along the outer tube, a sight-tube fixed4 on said member at right angles to the outer tube, a sight-tube fixed on the end of the innermost tube, an angular adjustment for the last-named sight-tube and a measure for the distances between the two tubes graduated to read distances of the objects sighted.

3. In a telemeter, a plurality of telescoping tubes, a supporting member on and adjustable along the outer tube and havinga measuring edge, a sight-tube iixed on the member at right angles to the telescopic tubes and in alinement with the measurin edge, a plate having a measuring edge fixed on the end of the innermost telescopic tube, a sight-tube in alinement with the edge on said plate, means on the plate to angularly adjust the second sight-tube, and means to measure the distance between the measuring edges.

4. In a telemeter, a plurality of rectangular telescoping tubes, a supporting member on and adjustable along the outer tube, and having a measuring edge thereon, a tapecase, and tape on one end of the outer tube, a sight-tube mounted on the member in vertical alinement with said edge at right angles to the telescoping tubes, a ball-and-socket joint on the member and a clamp on the ball and-socket joint, a. plate having a forked extension fixed on the end of the innermost telescoping tube and having a measuring edge, a sight-tube mounted on the plate in vertical alinement with the measuring edge and means in theforked extension to angugularly adjust the second sight-tube, substantially as and for the purpose set forth.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witnesses.

ALPHONSE JOORS. ADHEMAR MERCENIER. Witnesses:

Vieron LEONARD, GEORGES GLrsLArN. 

